This fuel pressure regulator is a component part of the SFI (sequential fuel injection) assembly, It resides inside of the air intake plenum and is accessed by removing the upper half of the intake
How To Replace Fuel Pressure Regulator 1997 Gmc Jimmy 4.3 Eng?
I have a 4.3 sfi and it wont start with it sits over night but once started it will start the rest of the day